Magneto



July 23, 1935.

R. c. GUTHRIE MAGNETO Filed April 17, 1934 2 Sheets-Sheet l .Gzdlu'i By M Filed April 1'7, 1934 2 Sheets-Sheet 2 Patented July 23, 1935 UNITED STATES PATENT OFFIE 4 Claims.

This invention relates to magnetos, and has for its object the production of a simple and efiicient magneto, the armature of which is mounted to produce a semi-rotary or oscillating movement, thereby producing an extremely quick break of the armature away from the contacting cores and consequently, producing a hot spark.

Another object of this invention is the production of a simple and efficient magneto, the armature of which is mounted for oscillating or semirotary movement, the armature being carried by a shaft which is mounted in suitable bearings to insure a quick break of the armature away from the contacting cores and thereby produce an extremely hot spark.

Another object of this invention is the production of a simple and efficient means for facili" tating the moving of the armature in a semirotary or oscillating movement, the operating lever being actuated through the medium of a yieldable driving bar of a special construction.

Other objects of the present invention will appear throughout the following specification and claims.

In the drawings:-

Figure 1 is a front elevation of the magneto embodying my invention, certain parts being shown in section;

Figure 2 is a section taken on line 2--2 of Figure 1;

Figure 3 is a section taken on line 3-3 of Figure 1;

Figure 4 is a front elevation of a portion of a magneto showing the armature in an open position and certain parts of the driving bar supporting casing being shown in section;

Figure 5 is a diagrammatic view of the armature showing the electrical circuit in diagram.

By referring to the drawings, it will be seen that ii! designates the magnet of the magneto or igniter, the magnet I supporting at the ends thereof the core shoes I I, and 12, as clearly illustrated in Figures 1 and 5. The shoe I I carries a core [3 having a flat contacting face l4 at its outer end and the shoe I2 carries a core l which core I5 is provided with an overhanging end 16 having a flat under contact face 11, as shown in Figure 1. The core I3 constitutes a straight bar, whereas the core I5 is substantially an inverted L-shaped construction. A coil I8 is mounted upon the core l3 and a coil I9 is similarly carried by the core l5, as shown clearly in Figure 1.

The armature consists of an elongated bar and like the cores l3 and I5 may be constructed in the manner common to the trade, such as is illustrated in the drawings, particularly in Figures 2 and The armature 2G is carried by a supporting shaft 2i, as shown clearly in Figure 2, and this shaft 2! also supports armature lever 22, the armature lever 22 normally extending at right angles to the armature 29, in Figure i. This armature lever 22 carries a roller 23 at its outer end, which roller 23 is engaged by the spring-pressed head 24 mounted upon either side of the roller, as shown in Figure 1, these heads 24 being slidably mounted within the driving bar supporting casing 25. This casing 25 is provided with an elongated socket 2B and the casing 25 is provided upon one side thereof with a slot ill through which the ature lever extends, the aperture 21 being 0 oient length to permit the lever 22 to freely swing for the purpose of providing a semi-rotary or os-- cillating movement of the shaft i. A spring 28 is carried in the outer end of the casing 25 and engages one of the heads 24 for contact with one side of the roller 23, and a coil spring 25 s carried within the opposite end of the socket engaging the head 24 for contacting with the opposite side of the roller 23. The inner end of the spring 29 engages the head portion 39 of the driving bar 34, which driving car it is reciprocably mounted within the bore 32 formed in one end of the casing 25, as shown clearly in Figure 1. This driving bar 3i projects beyond one end of the casing 25, as shown in Figure l, and car'- ries a roller 33, which roller 33 contacts with the operating arm 3 carried by the cam shaft 35, as is common to the trade.

Attention is now invited particularly to Figures 2 and 3 of the drawings, wherein it will be noted that the shaft 2i is provided with a reduced portion 40, which reduced portion 40 is supported by means of a suitable ball-bearing 4 l. A suitable supporting ball-bearing 42 also engages the shaft 2| near its opposite end, as shown in Figures 2 and 3, thereby providing the minimum amount of friction and greatly facilitating the easy operation of the shaft, or the easy semirotation or oscillating movement of the shaft through the action of the armature lever 22. The armature 20 may be held in position upon the shaft 2| in any suitable or desired manner, such for instance as through the medium of the securing nut 43 illustrated in Figures 2 and 3. It, of course, should be understood that the bearings 4| and 42 may be carried in any suitable or desired manner depending largely upon the particular type and character of engine upon which the present magneto or igniter is used. It should be further understood that without departing from the spirit of the invention, roller bearings may be substituted for the ball-bearing rings A! and 42, as illustrated in the drawings, but it is essential that the shaft be properly supported upon suitable bearings to reduce friction and to: facilitate a quick and easy operation of the supporting shaft.

A contact point 4'! is supported in any suitable or desired manner upon the reduced portion as of the shaft 2i, and is preferably carried Within the casing A cam 45 is carried by the outer end of the reduced extension 49 of the shaft 2!, as shown in Figures 2 and 3, and this cam 45 is adapted to actuate the spring-pressed arm 56 for opening and closing the breaker point til. The usual condenser 48 is carried by the casing 44, and the usual electrical connection made for the purpose of actuating a spark plug 49.

Having described the mechanical structure of the device for the purpose of carrying out the functions of the invention, attention may now be directed to Figure 5 illustrating a diagram of the electrical circuits involved. As shown in Figure 5, the coil is is provided. with a primary Winding Na and a secondary Winding i913. The coil i8 is provided with a primary winding I 811 and a secondary winding 58b. The primary Winding lea is connected to the primary winding l8a by means of a suitable wire 5i and the primary winding l8a is suitably connected, as at 5!, to the core l3. The secondary winding i8?) is suitably connected, as at 52, to the core shoe l l, as shown in Figure 5, and the secondary winding Nib is electrically connected to the spark plug is by means of a cable or wire 53. The secondary windings I91) and 5% are connected by means of a wire 36. a

It, of course, should be understood that certain detail changes in the electrical arrangement may be employed without departing from the spirit of the invention so long as such changes fall within the scope of the appended claims, and

it should be borne in mind that one of the important features of the present invention is the mounting of the armature in such a manner as to permit the use of ball-bearings in order to provide a support which may be as near as possible absolutely free from any friction, particularly in view of the fact that it is necessary in 'the construction of a device of this character that a magneto have a quick acting armature, the quicker the armature breaks away from the contacting cores, the hotter will be the spark produced. The structure of the device above described therefore accomplishes this very purpose, in that a very quick acting armature will be provided which will insure an extremely hot and positive spark.

Having described the invention, what is claimed as new is:-

1. A magneto of the class described comprising an armature, cores associated with said armature, coils associated with said cores, a make and break means electrically connected to said coils, said armature having a projecting operating arm, a driving bar, means for operating said driving bar, and yieldable means having frictional contact with said driving bar for engaging said armature operating arm for imparting oscillating movement to said armature.

2.v A magneto of the class described comprising an armature, cores associated with said armature, coils associatedwith said cores, a make and break means electrically connected to said coils, said armature having an operating lever extending at substantially right angles thereto, a roller carried by the outer end of said lever, a driving bar, a casing supporting said driving bar, means for actuating said driving bar, yieldable means carried by said driving bar and having frictional contact with one side of said roller, and yieldable means carried within said casing upon the opposite side of and having frictional contact with said rollerfor providing areturn yieldable action whereby a positive semi-rotary movement may be imparted to said armature.

3. A magneto of the class described comprising an armature, cores associated with said armature, coils associated with said cores, magnets associated with said coils, means for electrically connecting the coils, a make and break means, means for electrically connecting the coils with the make and break means, means for connecting the make and break means to a source of electrical supply, means for connecting the coils to a spark plug, and means for imparting semirotary movement to said armature to provide an instantaneous break of the armature away from the cores.

4. A magneto of the class described comprising an armature, a shaft supporting said armature, bearings for supporting said shaft for eliminating friction from the operation of said shaft, mag

'netic cores associated with said armature and adapted to contact therewith, an operating lever for imparting an oscillating movement to said armature to insure an instantaneous break of the armature away from the cores, a make and break means associated with the armature, coils associated with said cores, and means for provide ing an electrical connection between the coils and the spark plugs of an engine.

RICHARD C. GUTI-IRIE. 

